pthread_internal.h (3108B)
1 /* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 #ifndef AVCODEC_PTHREAD_INTERNAL_H 20 #define AVCODEC_PTHREAD_INTERNAL_H 21 22 #include "avcodec.h" 23 24 /* H.264 slice threading seems to be buggy with more than 16 threads, 25 * limit the number of threads to 16 for automatic detection */ 26 #define MAX_AUTO_THREADS 16 27 28 int ff_slice_thread_init(AVCodecContext *avctx); 29 void ff_slice_thread_free(AVCodecContext *avctx); 30 31 int ff_frame_thread_init(AVCodecContext *avctx); 32 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count); 33 34 #define THREAD_SENTINEL 0 // This forbids putting a mutex/condition variable at the front. 35 /** 36 * Initialize/destroy a list of mutexes/conditions contained in a structure. 37 * The positions of these mutexes/conditions in the structure are given by 38 * their offsets. Because it is undefined behaviour to destroy 39 * an uninitialized mutex/condition, ff_pthread_init() stores the number 40 * of successfully initialized mutexes and conditions in the object itself 41 * and ff_pthread_free() uses this number to destroy exactly the mutexes and 42 * condition variables that have been successfully initialized. 43 * 44 * @param obj The object containing the mutexes/conditions. 45 * @param[in] offsets An array of offsets. Its first member gives the offset 46 * of the variable that contains the count of successfully 47 * initialized mutexes/condition variables; said variable 48 * must be an unsigned int. Two arrays of offsets, each 49 * delimited by a THREAD_SENTINEL follow. The first 50 * contains the offsets of all the mutexes, the second 51 * contains the offsets of all the condition variables. 52 */ 53 int ff_pthread_init(void *obj, const unsigned offsets[]); 54 void ff_pthread_free(void *obj, const unsigned offsets[]); 55 56 /** 57 * Macros to help creating the above lists. mutexes and conds need 58 * to be parentheses-enclosed lists of offsets in the containing structure. 59 */ 60 #define OFFSET_ARRAY(...) __VA_ARGS__, THREAD_SENTINEL 61 #define DEFINE_OFFSET_ARRAY(type, name, cnt_variable, mutexes, conds) \ 62 static const unsigned name ## _offsets[] = { offsetof(type, cnt_variable), \ 63 OFFSET_ARRAY mutexes, \ 64 OFFSET_ARRAY conds } 65 66 #endif // AVCODEC_PTHREAD_INTERNAL_H